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Resize image (awt)
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class ResizeImageFrame extends JFrame {

    public ResizeImageFrame() throws IOException {
        setTitle("Resize image");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        JLabel img1 = new JLabel();
        img1.setIcon(new ImageIcon(getClass().getResource("/arrow_right.png")));
        add(img1);

        BufferedImage icon2 = ImageIO.read(getClass().getResource("/arrow_right.png"));
        // resize image
        AffineTransform transform = AffineTransform.getScaleInstance(30.0 / icon2.getWidth(), 30.0 / icon2.getHeight());
        AffineTransformOp op = new AffineTransformOp(transform, AffineTransformOp.TYPE_BILINEAR);
        icon2 = op.filter(icon2, null);
        JLabel img2 = new JLabel();
        img2.setIcon(new ImageIcon(icon2));
        add(img2);

        pack();
        Dimension sc = Toolkit.getDefaultToolkit().getScreenSize();
        setLocation(new Point((sc.width - getWidth()) / 2, (sc.height - getHeight()) / 2));
        setVisible(true);
    }

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub

        new ResizeImageFrame();
    }

}